Circuit extension-box.



C. W. ABBOTT, H. R. GILSON & J. M. G. FULLMAN.'

CIRCUIT EXTENSION BOX.

APPLICATION FILED MAY 26. 1914` Patented June 5, 1917.

2 SHEETS-SHEET I.

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WITN ESSESI INVEN'roRs Any'- 6 a 2- W @Ms A C. ABBOTT, H` R. GILSON & l. M. G. FULLMAN.

CIRCUIT EXTENSION BOX.

APPLICATION FILED MAY 26. |914.

Patented J une 5, 1917.

2 SHEETS-SHEET 2.

WITNESSESI INV NTQRS UNITED sTATEs PATENT OFFICE.

CHAUNCEY W. ABBOTT, OF AUBURN, NEW YORK, AND HENRY R. GILSON, 0F BAD] AND JAMES M. G. IEULLMAN,4 0F SEWICKLEY, PENNSYLVANIA, ASSIGNORS TO NATIONAL METAL MOLDING COMPANY, 0F PITTSBURGH, PENNSYLVANIA, A COR- IORATION.

Specification of Letters Patent.

CIRCUIT EXTENSION-Box.

Patented June 5, 1917.

Application led May 26, 1914. Serial No. 841,062.

To all lwhom t may concern.'

Be it known that we, CHAUNCEY W. AB- BoTT, residing at Auburn, Cayuga county, New York, HENRY R. GILsoN, residing at Baden, Beaver county, Pennsylvania, and

JMEs M. G. FULLMAN, residing at Sewickthe extended circuits are carried in surface conduits such as metal molding.

Our invention has to do with such extensions of electrical circuits and the object thereof is to provide an improved form of extension-box whereby a circuit may be picked up at, and extended from, wall switch outlets, particularly flush switch outlets. A more specioobject of our invention is to provide a box for the purpose described, which will have side walls andswitch-supporting brackets formed integrally with the base or bottom portion. A further object is to provide a box which may be used for various numbers of adjacent switches. And a still further object of our invention is to provide a means for adjusting circuit extension boxes in their attachment to wall outlet boxes, to the end that inaccuracies in the original setting of the outlet boxes will not cause the extension box y to rest askew on the wall.

box showing its adjustable connection to the outlet box; Fig. 3 a sectional View taken on the line III-III, Fig. 2; Fig. 4 a sectional view taken on the`line IV-IV, Fig. 3; Fig. 5 a perspective view of a box for a plurality of adjacent switches; and Fig. 6 a sectional view taken on the line VI-VI, Fig. 5.

In the several figures like numerals are used to designate like parts.

Flush switch structures, as illustrated herein, usually consist of a rectangular block of insulation 1 provided at its opposite ends with two pairs of binding posts between which electrical continuity may be controlled by a suitable pivoted arm operated by means of push buttons 2. Also a suitable metal attaching strip 8 extends longitudinally of the block of insulation and is suitably secured to the top of it. In the original installation of such switches to control electrical currents flowing through inner wall conductors, the usual practice has been, and now is, to place outlet b'oxes 3 in suitably provided openings in the wall and to vattach the inner-wall conduits 4 to such boxes, as shown in Fig. 1. The outlet box has an open face to receive the switch structure, and is provided with laterally extending lugs 5 having screw-threaded openings whereby the switch, through the attaching strip '8, is attached to the box. Such original installations are completed by attaching the conductors 6, 7 and 6a, 7a to thebinding posts of the switch, and securing a `suitable cover plate to the attaching strip 8.

In order to extend a supplemental circuit from such switch-receiving outlet boxes and through surface or metal molding conduits, We provide a circuit extension box adapted to be attached to the open face of the outlet box, and to which extension -box the switch may in turn be attached. Also the extension box surrounds the outer portion of the switch, permitting its inner portion to extend into the outlet box, and its walls, together with the outer portion of the switch, form a conductor-carrying passageway.

Referring to the embodiment of our invention illustrated in Figs. 1 to 4, the bottom portion 9 of the extension box is flat, extends laterally from all sides of the outsion boxes will rest'askew on the face of the. 40

let box 3, and is provided with a centralv opening 10 through which the body 1 of the switch structure may extend. A continuous wall 11 projects vertically from the peripheral edge of the bottom 9 and has a relatively narrow inwardly-extending ledge 12 at its upper edge adapted to form a seat for the cover plate 13, which is attached to the strip 8in the usual manner. Switch-supporting brackets 14 extend vertically from opposite ends of the inner edge of the bottom 9, and, as shown herein, may be formed integrally with the bottom. The se brackets are bent to form laterally-extending lugs 15 substantially in the plane of the edge 12, such lugs being provided with screw-threaded holes for the attachment of the switch strip 8.

By providing a relatively narrow ledge 12` and supporting the switch on brackets 14 extending from the bottom'of the box the conductorcarrying passageway surroundving the body of the switch is freely accessible.

A further advantage in having the brackets extending from the bottom is that the entire box may be made of integral construction, that is, the bracketand side walls may be formed integrally with the bottom and from a single sheet of metal, a suitablel series of die presses being used to form the sheet into the desired shape.

Our invention also has to do with the attachment of the extension box to the outlet box. It sometimes happens that outlet boxes, when placed in wall recesses, are not set true, so that when circuit extension boxes are attached to the lugs 5, no means i of adjustment being provided, such extenwall, which of course is undesirable. In order to have the boxes set squarely on the Vwall surface, and at the same time be securelyattached to obliquely set outlet boxes, we provide a means of attachment permittin of an adjustment of the extension box wit relation to outlet box in the general plane of their connection, the attaching means preferably being such that the extension box may be -applied to the'outlet box after the attaching screws are partly inserted into the lugs 5. c

The adjustment which wevprovide is preferably effected by forming .slots 16 and 17 in oppositely disposed portions of the bottomlO, such slots extending to each side of the center line of the box. The slot 17 diverges at one end from the central openin in the bottom 10 and is enlarged at suc end to receive the head of a screw 18 used for connecting 'the two boxes. Also, both slots open into the central opening of` the bottom 10, although it is essentia in this articular construction that only the slot 16 e provided with such4 opening to( receive the shank of the attaching screw 19 because the head of the screw 18 enters the slot 17 through the above mentioned enlarged outer end of the slot.l It is for convenience of manufacture, as well as for the purpose of rendering the circuit extension box capable of being connected to the outlet box otherwise than as hereinafter explained, that the slot 17 opens into the central opening.

In connecting-the extension box to the outlet box, the screws 18 and 19 being partially inserted into the lugs 5, the open end of the slot 16 is first slipped beneathl the head of the screw 19, and while the shank of such screw is in the contracted portion of such slot, the enlarged portion of the slot 17 is slip ed over the head of the screw 18.

The shan s of the screws 18 and 19 will then be within the slots 17 and 16, respectively, thus affording a temporary attachment which may be made secure by tightening the screws, the extension box being simultanecilisly held in squared position upon the wa In Figs. 5 and 6 we have illustrated substantially the same form of circuit extension box as that illustrated in Figs. 1 to 4 but made of several sections and adapted to receive a plurality of switch structures, in this instance four. The parts of this box may be designated as end sections 30 and intermediate sections 31 and 31a. The endsections, as illustrated herein, are, with the exce tion of the means for attaching them to tige intermediate sections, the same as the portion of the box of Figs. 1 to 4 shown to the left of the line A A, Fig. 2; while the intermediate sections consist of base portions 10, side walls 11a and brackets 14l all formed integrally from a single sheet of metal. The intermediate sections may consist of a number of single-bracket portions, as is indicated for the section 31, or they may be formed integrally throughout, as indicated at 31, and of a length depending on the number of adjacent switches there are in the particular installation for which the box 1s to be used. In order to connect the several sections into a box structure each intermediate section is rovided with a slot 32 at one end, and wit an off-set lug 33 at its other end. The end section is rovided at one end with an off-set lug 34 a apted to receive a screw 37 which engages the slot 32 of the intermediate section, and at the other `end of the end section there is a slot 35 `the open side of an outlet box for a switch and having a central open area adapted to receive the body of a switch, a side wall exextending laterally from opposite sides tending substantially vertical to said botthereof, a circuit extension box adjacent to tom and from the outer. edge thereof, said said open face and comprising a bottom bottom and side wall forming an open chanportion extending laterally from the sides nel to receive and contain electrical conof saidv outlet box and a wall projecting ductors, andV switch-supporting brackets vertically from the outer edge of the bottom formed integrally with said bottom portion portion, said bottom having a central openand extending from the edge of the central ing and provided with oppositely disposed opening therein at angles to the general elongated slots, and securing members explan'e of said bottom portion and in the same tending through said slots and engaging general direction as the side wall. said outlet box lugs, whereby said boxes may 2. A circuit extension box comprising a be adjusted with relation'to each other in substantially flat bottom portion adapted to the general plane of their attachment. be attached to and to extend from the open 5. The combination of an outlet box hav- -side of an outlet box for a switch and having an open face and provided with lugs ing a central opening adapted to receive the extending laterally from opposite sides body of a switch, a side wall extending subthereof, a circuit extension box adjacent to stantially vertical to said bottom portion said open face and having as a partthereof andfrom the outer edge thereof, said bottom a bottom portion extending laterally from and side wall forming an open channel to the sides of said outlet box, said bottom porreceive and contain electrical conductors, tion having a central opening registering and switch-supporting brackets extending with the open face of the outlet box and proangularly from the edge of the central openvided with a pair of screw-receiving eloning of the bottom portion and in the same gatedslots disposed on opposite sides of said general direction as said sidewall, said side opening, a screw extending through each of wall and brackets being formed integrally said slots and engaging said outlet box lugs,

with the bottom portion. the end of one of said slots diverging from 3. A circuit extension box comprising a said central bottom opening and provided bottom portion with a central opening, a with enlargement adapted to receive the side wall extending from the outer edge and heady tthe screw in such slot, and the other switch-supporting brackets from the inner of said slots opening into said central botedge of said bottom portion and substantom opening.

`tially vertical to the plane thereof, said wall In testimony whereof we have hereunto general direction therefrom, and said botand brackets being formed integrally with setour hands.

the bottom portion and extending substanl tially the same distance and in the same tom and side wall forming an open channel JA M G' FULLMAN to receive and contain electrical conductors. Witnesses:

4. The combination-of an outlet box hav- PAUL N. CRrrcHLow, ing an open .face and provided with lugs j FRANCIS J. ToMAssoN. 

